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If veca=2hati-6hatj-3hatk then |\veca| ...

If `veca=2hati-6hatj-3hatk ` then `|\veca|` =

A

`sqrt7`

B

7

C

6

D

5

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The correct Answer is:
B
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If veca=3hati-hatj+2hatk and vecb=2hati+3hatj+3hatk then veca.vecb is equal to :

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If veca=5hati-hatj-3hatk and vecb=hati+3hatj-5hatk , then show that the vectors (veca+vecb) and (veca-vecb) are perpendicular.

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JMD PUBLICATION-VECTOR ALGEBRA-EXAMPLE
  1. If veca=2hati-6hatj-3hatk then |\veca| =

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  2. Find x, y and z if vectors xhati-2hatj+zhatk=2hati-yhatj+hatk

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  3. If veca=2hati-hatj+hatk,vecb=3hati+2hatj-3hatk and vecc=hati+2hatj+hat...

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  4. Find a if the vectors vecx=2hati-3hatj+4hatk and vecy=ahati+6hatj-8hat...

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  5. Find p if vectors veca=2hati-hatj+phatk and vecb=hati-2hatj+hatk are p...

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  6. If veca is a unit vector and (vecx-veca).(vecx+veca)=255 then find |ve...

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  7. If veca=2hati+hatj+4hatk and vecb=3hati-2hatj+hatk then veca.vecb=

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  8. If |veca|=1,|vecb|=2 and veca*vecb=1. Then the angle between veca and ...

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  9. If |veca*vecb|=sqrt3|vecaxxvecb|,then angle between veca and vecb is :

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  10. Find |veca-vecb|, if two vectors veca and vecb are such that |veca|=2,...

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  11. Fill in the blanks : If veca=xhati+2hatj-3hatk and vecb=3hati+bhatj-...

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  12. Fill in the blanks : Unit vector in direction of 2hati-3hatj+6hatk=(...

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  13. Fill in the blanks : If veca=3hati+hatj-2hatk and vecb=hati+lamdahat...

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  14. If |veca*vecb|=|vecaxxvecb|,then angle between veca and vecb is :

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  15. Fill in the blanks : If |\vecaxxvecb|^2+(veca.vecb)^2=400 and |\vec...

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  16. State True/False The value of veca.veca is |\veca|^2.

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  17. State True/False If veca is unit vector and (2vecx-3veca).(2vecx+3ve...

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  18. State True/False Then magnitude of 2hati-3hatj+6hatk is 7 units.

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  19. Write the value of (hatixxhatj).k+(hatjxxhatk).hati.

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  20. Write the value of p for which veca=3hati+2hatj+9hatk and vecb=hati+ph...

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